//src/stores/student.js
import { defineStore } from "pinia";
import { ref } from "vue";

//Local Strorage 的键名
const STORAGE_KEY = 'user_data'
const DEFAULT_ADMIN = {
    id:'admin',
    username:'admin',
    password:'admin123',
    role:'admin',
    name:'系统管理员'
}

//从Local Strorage中读取数据
const loadUsers = () => {
    const storedData = localStorage.getItem(STORAGE_KEY)
    const users =  storedData ? JSON.parse(storedData) : []

    if(!users.some(user => user.role === 'admin')){
        users.push(DEFAULT_ADMIN)
        saveUsers(users)
    }
    return users
}

//将数据保存到Local Strorage中
const saveUsers = (users) => {
    localStorage.setItem(STORAGE_KEY,JSON.stringify(users))
}

export const useMemberStore = defineStore('member',()=>{
    const users = ref(loadUsers());

    const addUser = (user) => {
        user.id = Date.now()
        if (user.role === 'teacher'){
            users.subject = []
        }
        user.grades = {
            frontend:null,
            english:null,
            python:null
        };
        users.value.push(user);
        saveUsers(users.value)
    }

    const updateUser = (id,updateInfo) =>{
        const user =users.value.find((u) => u.id === id)
        if(user){
            Object.assign(user,updateInfo)
            saveUsers(users.value)
        }
    }

    const updateStudentGrades = (id,grades) => {
        const student = users.value.find((u) => u.id === id && u.role === 'student')
        if(student){
            student.grades = {...student.grades,...grades};
            saveUsers(users.value)
        }
    }

    const getUserById = (id) => {
        return users.value.find((u) => u.id ===id)
    }

    const getUserByUsername = (username) => {
        return users.value.find((u) => u.username === username)
    }

    const deleteUser = (id) => {
        users.value = users.value.filter((u) => u.id !== id)
        saveUsers(users.value)
    }

    const getAllStudents = () => {
        return users.value.filter((u) => u.role === 'student')
    }

    const updateTeacherSubjects = (id,subjects) => {
        const teacher = users.value.find((u) => u.id === id && u.role === 'teacher')
        if (teacher) {
            teacher.subjects = subjects
            saveUsers(users.value)
        }
    }

    return {users,addUser,getUserById,getUserByUsername,deleteUser,getAllStudents,updateStudentGrades,updateTeacherSubjects};
})